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Investments in Real Estate Ventures (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) investment | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in real estate ventures | $ 381.0 |  | $ 376.2
Number of separate property or fund co-investments | investment | 43 |  |
Minimum ownership percentage in real estate ventures (in hundredths) | 1.00% |  |
Maximum ownership percentage in real estate ventures (in hundredths) | 10.00% |  |
Property, Plant and Equipment, Net, consolidated VIE | $ 561.9 |  | 543.9
Total assets | 9,204.2 |  | 9,254.4
Other Liabilities, Noncurrent, consolidated VIE | 361.3 |  | 332.3
Total liabilities | 5,728.5 |  | 5,872.4
Total liabilities and equity | 9,204.2 |  | 9,254.4
Revenue, consolidated VIE | 3,555.2 | $ 3,117.7 |
Net income | 42.6 | 7.7 |
Fair Value [Abstract] |  |  |
Fair value investments at beginning of the period | 242.3 | 212.7 |
Investments in Real Estate Ventures, at Fair Value, Additions | 2.6 | 9.0 |
Investments in Real Estate Ventures, at Fair Value, Distributions | 22.5 | 9.6 |
Unrealized Gain (Loss) on Investments | 5.8 | (1.7) |
Investments in Real Estate Ventures, at Fair Value, Foreign Currency Translation | 5.3 | 3.6 |
Fair value investments at end of the period | $ 233.5 | 214.0 |
LaSalle Investment Company II [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Partnership ownership interest (in hundredths) | 48.78% |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | $ 61.6 |  |
Exclusive of LaSalle Investment Company II [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted | 209.8 |  |
Equity Method Investments [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in real estate ventures | 13.7 |  | 12.6
Property, Plant and Equipment, Net, consolidated VIE | 42.7 |  | 15.7
Other Assets, consolidated VIE | 9.3 |  | 44.4
Total assets | 65.7 |  | 72.7
Other Liabilities, Noncurrent, consolidated VIE | 0.9 |  | 30.9
Loans Payable, Fair Value Disclosure, consolidated VIE | 29.8 |  | 9.2
Total liabilities | 30.7 |  | 40.1
Members' Equity, consolidated VIE | 35.0 |  | 32.6
Total liabilities and equity | 65.7 |  | $ 72.7
Revenue, consolidated VIE | 1.0 | 1.6 |
Other Expenses, consolidated VIE | (0.8) | (1.2) |
Gains (Losses) on Sales of Investment Real Estate, consolidated VIE | 1.5 | 0.0 |
Net income | $ 1.7 | $ 0.4 |

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